From: Don Zickus Date: Fri, 14 Mar 2014 14:43:44 +0000 (-0400) Subject: perf tools: Speed up thread map generation X-Git-Tag: v3.15-rc1~181^2~1^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=363b785f3805a2632eb09a8b430842461c21a640;p=pandora-kernel.git perf tools: Speed up thread map generation When trying to capture perf data on a system running spejbb2013, perf hung for about 15 minutes. This is because it took that long to gather about 10,000 thread maps and process them. I don't think a user wants to wait that long. Instead, recognize that thread maps are roughly equivalent to pid maps and just quickly copy those instead. To do this, I synthesize 'fork' events, this eventually calls thread__fork() and copies the maps over. The overhead goes from 15 minutes down to about a few seconds. -- V2: based on Jiri's comments, moved malloc up a level and made sure the memory was freed Signed-off-by: Don Zickus Acked-by: Jiri Olsa Cc: Jiri Olsa Cc: Joe Mario Link: http://lkml.kernel.org/r/1394808224-113774-1-git-send-email-dzickus@redhat.com Signed-off-by: Arnaldo Carvalho de Melo --- Reading git-diff-tree failed